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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19cdd6b7e75a54287f116beacbd49f0308ee3001eb66be6f45491caba743219' 
  AND token = 'KqFyh6RTL/y+q64YevBe4aXJYJMmsFR8LMW67nRN3gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}